Journal ArticleDOI
Nitrogen mineralization: challenges of a changing paradigm
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A complete new conceptual model of the soil N cycle needs to incorporate recent research on plant–microbe competition and microsite processes to explain the dynamics of N across the wide range of N availability found in terrestrial ecosystems.Abstract:
Until recently, the common view of the terrestrial nitrogen cycle had been driven by two core assumptions—plants use only inorganic N and they compete poorly against soil microbes for N. Thus, plants were thought to use N that microbes “left over,” allowing the N cycle to be divided cleanly into two pieces—the microbial decomposition side and the plant uptake and use side. These were linked by the process of net mineralization. Over the last decade, research has changed these views. N cycling is now seen as being driven by the depolymerization of N-containing polymers by microbial (including mycorrhizal) extracellular enzymes. This releases organic N-containing monomers that may be used by either plants or microbes. However, a complete new conceptual model of the soil N cycle needs to incorporate recent research on plant–microbe competition and microsite processes to explain the dynamics of N across the wide range of N availability found in terrestrial ecosystems. We discuss the evolution of thinking abou...read more
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Journal ArticleDOI
Radiocarbon evidence for the mining of organic nitrogen from soil by mycorrhizal fungi
Erik A. Hobbie,Andrew P. Ouimette,Edward A. G. Schuur,Daniel Kierstead,James M. Trappe,Katriina Bendiksen,Esteri Ohenoja +6 more
TL;DR: The results indicate that radiocarbon can provide evidence of organic nitrogen use in ectomycorrhizal fungi and reflects the exploration depth of different taxa.
Journal ArticleDOI
Intact amino acid uptake by northern hardwood and conifer trees.
Anne Gallet-Budynek,Anne Gallet-Budynek,Edward R. Brzostek,Vikki L. Rodgers,Vikki L. Rodgers,Jennifer M. Talbot,Jennifer M. Talbot,Sharon Hyzy,Adrien C. Finzi +8 more
TL;DR: This study shows that amino acid uptake is an important process occurring in two widespread, northeastern US temperate forest types with widely differing rates of N cycling.
Journal ArticleDOI
Reciprocal transfer effects on denitrifying community composition and activity at forest and meadow sites in the Cascade Mountains of Oregon
TL;DR: In this article, the effects of disturbance, vegetation type, and microclimate on denitrification and denitrifier community composition were examined at the H. J. Andrews Experimental Forest in the Cascade Mountains of Oregon.
Journal ArticleDOI
Foliar and soil δ15N values reveal increased nitrogen partitioning among species in diverse grassland communities
Marlén Gubsch,Christiane Roscher,Gerd Gleixner,Maike Habekost,Annett Lipowsky,Bernhard Schmid,Ernst Detlef Schulze,Sibylle Steinbeiss,Nina Buchmann +8 more
TL;DR: These functional group and species specific shifts in the uptake of different N sources with increasing diversity indicate complementary resource use in diverse communities.
Journal ArticleDOI
Probabilistic dynamics of soil nitrate: Coupling of ecohydrological and biogeochemical processes
Gianluca Botter,Edoardo Daly,Amilcare Porporato,Ignacio Rodriguez-Iturbe,Andrea Rinaldo,Andrea Rinaldo +5 more
TL;DR: In this paper, the authors present a Web of Science Record created on 2009-06-22, modified on 2017-07-16.Reference ECHO-ARTICLE-2008-008
References
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Journal ArticleDOI
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